I had great luck by calling B&W directly for a plastic clip for my N802s. Price was $5.40 plus shipping. Same part was $62 locally. I suggest you call them and find out how much the tweeter costs then decide.

those are very simple to fix, what is broken on it, the housing, just the tweeter itself? The tweeter bascily is held in by pressure via a locking ring. That was a hell of a buy there for $700. Great speaker too. (I own a pair so Im a little biased :).)

I own the 803s(newer version) and just replaced my tweeter. On mine all I had to do was take the front tweeter grill off / unscrew the back portion of the tweeter and gently pull the tweeter out. The tweeter is held in by two clips on each side. Used needled nose pliers to reattach. Told less than 5mins.